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This will not be the most professional review you'll read. I will offer my experience of only the sound and build quality of these IEMS from an average consumer's point of view.
Just to give some reference, I'm currently rocking the Sony MDR-EX650AP as my daily earphones. For being earphones with balanced drivers at $60, they really have no weaknesses to speak of , which is...” --Bitsir

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At the time of the review, the Hisoundaudio HSA-AD1 was was on sale on Penon Audio’s website. Here is a link to their listing of the product:
http://penonaudio.com/Hisoundaudio-HSA-AD1
Introduction
Here we go, another hybrid in-ear hitting the market!
Have you noticed a theme here? It seems like all the sudden there’s an explosion of these things, and truth be told...” --Hisoundfi

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Preamble:
HiSoundAudio (http://www.hisoundaudio.com/en/index.asp, not up to date) is a Chinese audio company, known for their in-ears and audio players. Besides their new DAP, they are also about to come out with a new in-ear model.
Having talked to Jack from HiSoundAudio, he said that they are extremely confident about their upcoming single-BA in-ear which is...” --HiFiChris

“Quick intro:
I've come from a fair amount of "treble happy" headphones (Grado sr125i, Beyerdynamic dt880 pro, heir audio 3.a1), and some that are a little in between (Hifiman He400, Fostex Te-05).
I listen to a large amount of classic rock, some blues, and a lot of EDM, with a smattering of orchestral and vocally-focused music thrown in.
I purchased these to get some experience with...” --nwguy

“I am a Grado fan. More precisely, I am a Grado modder. Everything I listen to is tinkered with, and woodied….Needless to say, I favor a bright sound signature, open-backs and am not very into IEMs. For all of my listening I use my FiiO X5 on low gain, loaded with 16/44 FLAC files. IEMs are a necessary evil in an occasionally noisy world, but given I have oddly shaped ear canals (thanks to a...” --fleasbaby

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Disclaimer: Rather than being an audiophile like most of the members here, I consider myself to be just an enthusiast consumer. I have very limited experience with headphones and anyone looking at my current review should be aware of that.
The PAA-1's are my first decent earphones. Despite being entry-level if judged by price and appearance alone, the sound they produce is good and...” --horizon21

“Foreword:
I'm a production manager, but mainly focus on live sound engineering and lighting. I install and tune P.A equipment, and mix live acts in:
- live venues,
- concert halls,
- bars, and
- nightclubs.
I've taken a huge liking to headphones - IEMs in particular. I like the idea of having my own personal PA system that I can take with me anywhere. With Rockbox being in such...” --White Lotus

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I am always on the search for great in-ear headphones, however I always seem to find the same problem, because they are in ear, they tend to have very small drivers, meaning there is never much bass, and in most cases the highs are also messed up in an effort to get more bass!
So I am always on the lookout for in-ear headphones that have good bass, yet have a nice flat frequency...” --MyConnor5Review

“Introducing HiSound Audio's Crystal IEMs
After reviewing HSA's E212 and PAA-1Pro recently, Jack approached me and asked if I'd like a review sample of the Crystal (IEM) and Living (Earbuds). I jumped at the chance, and after paying for the freight - they duly arrived a couple of weeks ago. I’ve listed price at the RRP of ~ USD $69 – this is not what I paid for them...” --Brooko

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So after a day of somewhat abusive run in (free and impatient) and tip rolling, I can say these easily play in a realm at or above their $100 price point. The stock tips are fine and Grado tips also work well but try a few doubles on them all the way to the base and you may get really great results. The stock tips are short and I prefer those up near the tip, the Grado/Orto tips...” --goodvibes